Bad src URL raises noncritical error

[jvansanten]

Given a bad URL, exe.setupClass() raises a NoncriticalError, e.g.

2017-07-27 14:19:58,439 WARNING exe : attempting to download class /lustre/fs20/group/icecube/safferj/simulation/Gen2-Scripts/segments/muongun.py to /scratch/17456099.cream02.iihe.ac.be/glidein/execute.192.168.26.5-25682/dir_28943/tmpHPe8IZ/local_temp
2017-07-27 14:19:58,440 WARNING exe : attempting to download class /lustre/fs20/group/icecube/safferj/simulation/Gen2-Scripts/segments/muongun.py to /scratch/17456099.cream02.iihe.ac.be/glidein/execute.192.168.26.5-25682/dir_28943/tmpHPe8IZ/local_temp
2017-07-27 14:19:58,442 ERROR i3exec_runner : task failed, exiting without running completion steps.
Traceback (most recent call last):
File "/cvmfs/icecube.opensciencegrid.org/iceprod/master/RHEL_6_x86_64/lib/python2.7/site-packages/iceprod/core/i3exec.py", line 275, in runner
iceprod.core.exe.runtask(cfg, env, task)
File "/cvmfs/icecube.opensciencegrid.org/iceprod/master/RHEL_6_x86_64/lib/python2.7/site-packages/iceprod/core/exe.py", line 634, in runtask
runtray(cfg, env, tray, stats=tmpstat)
File "/cvmfs/icecube.opensciencegrid.org/iceprod/master/RHEL_6_x86_64/lib/python2.7/site-packages/iceprod/core/exe.py", line 669, in runtray
runmodule(cfg, env, module, stats=tmpstat)
File "/cvmfs/icecube.opensciencegrid.org/iceprod/master/RHEL_6_x86_64/lib/python2.7/site-packages/iceprod/core/exe.py", line 699, in runmodule
process = fork_module(cfg, env, module)
File "/cvmfs/icecube.opensciencegrid.org/iceprod/master/RHEL_6_x86_64/lib/python2.7/site-packages/iceprod/core/exe.py", line 769, in fork_module
setupClass(env,c)
File "/cvmfs/icecube.opensciencegrid.org/iceprod/master/RHEL_6_x86_64/lib/python2.7/site-packages/iceprod/core/exe.py", line 487, in setupClass
raise util.NoncriticalError('Cannot find class %s because of bad src url'%class_obj['name'])
NoncriticalError: NoncriticalError('Cannot find class muongun.py because of bad src url')

Error and logging levels are a matter of taste, but it seems like this is more than noncritical.